package com.example.administrator.mvp.adapter.section;

import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by hcc on 16/8/27 11:51
 * 100332338@qq.com
 * <p/>
 * Abstract Section used by SectionedRecyclerViewAdapter.
 */
public abstract class Section {

  public enum State {
    LOADING, LOADED, FAILED
  }

  private State state = State.LOADED;

  boolean visible = true;

  boolean hasHeader = false;

  boolean hasFooter = false;

  Integer headerResourceId;

  Integer footerResourceId;

  int itemResourceId;

  private Integer loadingResourceId;

  private Integer failedResourceId;


  /**
   * Package-level constructor
   */
  Section() {

  }


  /**
   * Create a Section object with loading/failed states but no header and footer
   *
   * @param itemResourceId layout resource for its items
   * @param loadingResourceId layout resource for its loading state
   * @param failedResourceId layout resource for its failed state
   */
  public Section(int itemResourceId, int loadingResourceId, int failedResourceId) {

    this.itemResourceId = itemResourceId;
    this.loadingResourceId = loadingResourceId;
    this.failedResourceId = failedResourceId;
  }


  /**
   * Create a Section object with loading/failed states, a custom header but no footer
   *
   * @param headerResourceId layout resource for its header
   * @param itemResourceId layout resource for its items
   * @param loadingResourceId layout resource for its loading state
   * @param failedResourceId layout resource for its failed state
   */
  public Section(int headerResourceId, int itemResourceId, int loadingResourceId, int failedResourceId) {

    this(itemResourceId, loadingResourceId, failedResourceId);
    this.headerResourceId = headerResourceId;
    hasHeader = true;
  }


  /**
   * Create a Section object with loading/failed states, a custom header and footer
   *
   * @param headerResourceId layout resource for its header
   * @param footerResourceId layout resource for its footer
   * @param itemResourceId layout resource for its items
   * @param loadingResourceId layout resource for its loading state
   * @param failedResourceId layout resource for its failed state
   */
  public Section(int headerResourceId, int footerResourceId, int itemResourceId, int loadingResourceId, int failedResourceId) {

    this(headerResourceId, itemResourceId, loadingResourceId, failedResourceId);
    this.footerResourceId = footerResourceId;
    hasFooter = true;
  }


  /**
   * Set the State of this Section
   *
   * @param state state of this section
   */
  public final void setState(State state) {

    this.state = state;
  }


  /**
   * Return the current State of this Section
   *
   * @return current state of this section
   */
  public final State getState() {

    return state;
  }


  /**
   * Check if this Section is visible
   *
   * @return true if this Section is vibisle
   */
  public final boolean isVisible() {

    return visible;
  }


  /**
   * Set if this Section is visible
   *
   * @param visible true if this Section is visible
   */
  public final void setVisible(boolean visible) {

    this.visible = visible;
  }


  /**
   * Check if this Section has a header
   *
   * @return true if this Section has a header
   */
  public final boolean hasHeader() {

    return hasHeader;
  }


  /**
   * Set if this Section has header
   *
   * @param hasHeader true if this Section has a header
   */
  public final void setHasHeader(boolean hasHeader) {

    this.hasHeader = hasHeader;
  }


  /**
   * Check if this Section has a footer
   *
   * @return true if this Section has a footer
   */
  public final boolean hasFooter() {

    return hasFooter;
  }


  /**
   * Set if this Section has footer
   *
   * @param hasFooter true if this Section has a footer
   */
  public final void setHasFooter(boolean hasFooter) {

    this.hasFooter = hasFooter;
  }


  /**
   * Return the layout resource id of the header
   *
   * @return layout resource id of the header
   */
  public final Integer getHeaderResourceId() {

    return headerResourceId;
  }


  /**
   * Return the layout resource id of the footer
   *
   * @return layout resource id of the footer
   */
  public final Integer getFooterResourceId() {

    return footerResourceId;
  }


  /**
   * Return the layout resource id of the item
   *
   * @return layout resource id of the item
   */
  public final int getItemResourceId() {

    return itemResourceId;
  }


  /**
   * Return the layout resource id of the loading view
   *
   * @return layout resource id of the loading view
   */
  public final Integer getLoadingResourceId() {

    return loadingResourceId;
  }


  /**
   * Return the layout resource id of the failed view
   *
   * @return layout resource id of the failed view
   */
  public final Integer getFailedResourceId() {

    return failedResourceId;
  }


  /**
   * Bind the data to the ViewHolder for the Content of this Section, that can be the Items,
   * Loading view or Failed view, depending on the current state of the section
   *
   * @param holder ViewHolder for the Content of this Section
   * @param position position of the item in the Section, not in the RecyclerView
   */
  public final void onBindContentViewHolder(RecyclerView.ViewHolder holder, int position) {

    switch (state) {
      case LOADING:
        onBindLoadingViewHolder(holder);
        break;
      case LOADED:
        onBindItemViewHolder(holder, position);
        break;
      case FAILED:
        onBindFailedViewHolder(holder);
        break;
      default:
        throw new IllegalStateException("Invalid state");
    }
  }


  /**
   * Return the total of items of this Section, including content items (according to the section
   * state) plus header and footer
   *
   * @return total of items of this section
   */
  public final int getSectionItemsTotal() {

    int contentItemsTotal;

    switch (state) {
      case LOADING:
        contentItemsTotal = 1;
        break;
      case LOADED:
        contentItemsTotal = getContentItemsTotal();
        break;
      case FAILED:
        contentItemsTotal = 1;
        break;
      default:
        throw new IllegalStateException("Invalid state");
    }

    return contentItemsTotal + (hasHeader ? 1 : 0) + (hasFooter ? 1 : 0);
  }


  /**
   * Return the total of items of this Section
   *
   * @return total of items of this Section
   */
  public abstract int getContentItemsTotal();


  /**
   * Return the ViewHolder for the Header of this Section
   *
   * @param view View inflated by resource returned by getHeaderResourceId
   * @return ViewHolder for the Header of this Section
   */
  public RecyclerView.ViewHolder getHeaderViewHolder(View view) {

    return new SectionedRecyclerViewAdapter.EmptyViewHolder(view);
  }


  /**
   * Bind the data to the ViewHolder for the Header of this Section
   *
   * @param holder ViewHolder for the Header of this Section
   */
  public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder) {
    // Nothing to bind here.
  }


  /**
   * Return the ViewHolder for the Footer of this Section
   *
   * @param view View inflated by resource returned by getFooterResourceId
   * @return ViewHolder for the Footer of this Section
   */
  public RecyclerView.ViewHolder getFooterViewHolder(View view) {

    return new SectionedRecyclerViewAdapter.EmptyViewHolder(view);
  }


  /**
   * Bind the data to the ViewHolder for the Footer of this Section
   *
   * @param holder ViewHolder for the Footer of this Section
   */
  public void onBindFooterViewHolder(RecyclerView.ViewHolder holder) {
    // Nothing to bind here.
  }


  /**
   * Return the ViewHolder for a single Item of this Section
   *
   * @param view View inflated by resource returned by getItemResourceId
   * @return ViewHolder for the Item of this Section
   */
  public abstract RecyclerView.ViewHolder getItemViewHolder(View view);

  /**
   * Bind the data to the ViewHolder for an Item of this Section
   *
   * @param holder ViewHolder for the Item of this Section
   * @param position position of the item in the Section, not in the RecyclerView
   */
  public abstract void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position);


  /**
   * Return the ViewHolder for the Loading state of this Section
   *
   * @param view View inflated by resource returned by getItemResourceId
   * @return ViewHolder for the Loading state of this Section
   */
  public RecyclerView.ViewHolder getLoadingViewHolder(View view) {

    return new SectionedRecyclerViewAdapter.EmptyViewHolder(view);
  }


  /**
   * Bind the data to the ViewHolder for Loading state of this Section
   *
   * @param holder ViewHolder for the Loading state of this Section
   */
  public void onBindLoadingViewHolder(RecyclerView.ViewHolder holder) {
    // Nothing to bind here.
  }


  /**
   * Return the ViewHolder for the Failed state of this Section
   *
   * @param view View inflated by resource returned by getItemResourceId
   * @return ViewHolder for the Failed of this Section
   */
  public RecyclerView.ViewHolder getFailedViewHolder(View view) {

    return new SectionedRecyclerViewAdapter.EmptyViewHolder(view);
  }


  /**
   * Bind the data to the ViewHolder for the Failed state of this Section
   *
   * @param holder ViewHolder for the Failed state of this Section
   */
  public void onBindFailedViewHolder(RecyclerView.ViewHolder holder) {
    // Nothing to bind here.
  }
}
